He isn't 'stealing' in any conventional way, nor on the outside is he taking credit for anything that I can see. All the link destinations are identical to the original, hell if he keeps it up, you will be getting your bandwidth served for free.

He even left the name of the original URL of the page in the source. He's either the most incompetent web 'thief' on the planet or something else is going on...

If I had to guess I'd say he likes the look and feel of your website and is using your home page as a template and springboard for his efforts. His default page doesn't even link to yours, as far as I can see you can only get there by using the link you posted or something like google...

He only has a rendered static version of a single page, and probably just wants to use it as a template. No doubt this is infringing, unethical, and infuriating, but to add insult to injury there is potential for search engines to treat it as a cloak/gateway/doorway page which could have subsequent effect on my site. Now to add salt to the wound, I have commercial interest in the site and there is potential for it to have serious effect if it doesn't come down quick, or even if any similar code/references remain

I just don't think he understands the consequences of his actions aside from using someone else's code to make his own website look good.

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"The human mind is so constituted that it colours with its own previous conceptions any new notion that presents itself for acceptance." - J. Wilhelm. (But I still think mine sounds better than yours.)